Re: ASM and EMC PowerPath

Thanks Goran,
yes, in your case querydisk -d reports the pseudo-device (emcpowerXn).

It seems that, at least with kernel 2.6, either path (emcpower or sd) could be used
(see www.freelists.org/post/oracle-l/ASM-and-EMC-PowerPath,24).

Just curious,
did you configure ORACLEASM_SCANORDER in /etc/sysconfig/oracleasm?

Best regards
Dimitre

On 20/04/2011 13:17, goran bogdanovic wrote:
>
>
> querydisk -d returns the major/minor of one of the physical paths
> to the disk, not the emcpower path (I checked /proc/partitions for
> that),
> that's why I think it actually doesn't use the logical devices.
> I say "I think", because I'm not finding this anywhere in the docs
> for now.
>
>
> in my case:
>
> oracle_at_momos_at_+ASM: ~
> -bash-3.2 $ oracleasm querydisk -p vol1
> Disk "VOL1" is a valid ASM disk
> /dev/emcpowera1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdx1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdm1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdb1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdai1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdat1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdbe1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdbp1: LABEL="VOL1" TYPE="oracleasm"
> /dev/sdca1: LABEL="VOL1" TYPE="oracleasm"
>
> oracle_at_momos_at_+ASM: ~
> -bash-3.2 $ oracleasm querydisk -d vol1
> Disk "VOL1" is a valid ASM disk on device [120, 1]
>
> -bash-3.2 $ cat /proc/partitions |grep '120'
> 120 48 281018368 emcpowerd
> 120 49 281016981 emcpowerd1
> 120 64 41943040 emcpowere
> 120 65 41943024 emcpowere1
> 120 0 281018368 emcpowera
> 120 1 281001984 emcpowera1 <==
> 120 16 281018368 emcpowerb
> 120 17 281001984 emcpowerb1
> 120 32 281018368 emcpowerc
> 120 33 281001984 emcpowerc1
> 120 144 281018368 emcpowerj
> 120 145 281001984 emcpowerj1
> 120 160 281018368 emcpowerk
> 120 161 281001984 emcpowerk1
> 120 80 281018368 emcpowerf
> 120 81 281001984 emcpowerf1
> 120 128 281018368 emcpoweri
> 120 129 281001984 emcpoweri1
> 120 112 281018368 emcpowerh
> 120 113 281001984 emcpowerh1
> 120 96 281018368 emcpowerg
> 120 97 281001984 emcpowerg1
>
> regards,
> goran
>
>

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